How to use MQTT in Node-Red: basics, examples, tip & tricks

Want to learn how to communicate with MQTT in Node-Red? Here you can learn how to connect to an MQTT broker, subscribe to topic, send data to the server, handle different data types, use dynamic subscription and other tips and tricks. By the end of this tutorial, you'll be able to send and subscribe to MQTT messages with ease!
MQTT is a powerful messaging platform that can be used to control devices and machines remotely. In this tutorial, we'll be using Node-Red to send and receive MQTT messages. By the end of this tutorial, you'll be able to use MQTT to control your Node-Red projects!
Sensor toolbox video: • Utility nodes for sens...
If you like what I do here, you can support me with RUclips Thanks, or Patreon:
/ csongorvarga
Chapter:
0:00 Intro
0:07 Chapters
1:56 Prerequisite
2:54 Connect to an MQTT broker
5:37 Subscribe to a topic
8:11 Sending MQTT messages
10:04 MQTT Explorer
11:36 Door sensor example
13:46 Timer switch example
14:56 Data types
20:45 Dynamic subscription
25:20 Toolbox examples
28:09 Recap

[@myozone]

Thanks for this, I've been using Node-red for years but nice to be reminded of the basics and also the newer Node-red changes.

[@7null]

Great overview for the new - like me

[@bipod211]

Great video 👌

[@csongorvarga]

Thanks!

[@p23rodriguez]

Thank you for this video!!!!

[@fsprtube]

To elaborate: Store data at 00:00, 00:01, 00:02, 00:03,..................23:00: and full day delta for kwh_produced, kwh_consumed, gas_consumed.

[@Dr.SherazAslam]

very very nice video. appreciated

[@Dr.SherazAslam]

Do you prepared any video that can help storing data having multiple fields on the same topic? How I can store different fields in influxdb via node red. Now I’m able to store single value

[@jumadhaheri]

Nice this is great

[@fsprtube]

Hi Csongor, nice videaos and keep up the effort.
I have used the storing of data in csv files and it works great. For Sensors t his is great. I have a MQTT with meterdata and want to only store at the whole hr and at 00:00 Can there be a time/data functionality be added?

[@csongorvarga]

Thanks. Yes, there is an option. Store the data that comes in from the MQTT node in a flow variable. And have a separate inject node that runs every hour and fetch the data from the flow variable. It will contain the latest data as new data always overwrites the one came before.

[@rozymahsun]

Nice

[@vanderleisilvasantos5343]

Nice man, can you explains how to connect with Alexa

[@csongorvarga]

I there are a set of Alexa specific nodes, but I don't have any Alexa devices, so this is all I know.

[@mohsinjessa8951]

Just started watching this video...and first suggestion...first slide "Content" line "Connecting to the MQTT Broken" change broken to broker.

[@csongorvarga]

ahhh, thanks. Too bad it is not possible to change video on YT once uploaded.

[@bpetrikovics]

"Connecting to the MQTT broken" on the contents should be broker, probably :)

[@csongorvarga]

Did I say broken? Hahaha

[@ainaamarni2476]

Hi why is my mqtt in just keep connecting

[@csongorvarga]

On the right when you see your debug, go to the Configuration Nodes and check to make sure you don't have duplicate configuration for the same MQTT server. I had this issue once.

[@eamonhannon1103]

Way to much elaboration or unnecessary details